I didn't mean minority view in any kind of derogatory way. As it happens I think that 'society's view'of what is acceptable for relationships that involve romatic love and/or sex is hypocritical.
People have always found ways of opting out of lifelong monogamy. Before divorce was socially acceptable, affairs and lovers filled that gap and not just for the upper classes. Since divorce has been more socially acceptable divorce and/or serial monogamy has been a way of avoiding lifelong monogamy with the same person.
Throw into the pot the sex industry, porn, casual sexual encounters and other associated sexual outlets and there is a lot of scope for people to deviate from what society deems is 'acceptable'.
"I think it would be interesting to throw the sex out of the window here in this discussion and focus on caring, responsibility, love etc - for one person- rather than the alternative, which is loving no one especially and having several friendships which involve sex."
Well, yes, I think that is a huge part of a committed relationship but no-one would argue that it is morally reprehensible to love, care and be responsible for more than one's spouse - that role is required for bringing up children for a start. Wider family, close friends - what is wrong with loving and caring for them too?